Denon AVR-1804 Service Manual page 89

1 2
SCHEMATIC DIAGRAMS (11/11)
FE401 FTH4-401TB
L401
1 2 3 4 5 6 7 8
1UH
C402
C401
1N-K 1N-K
R471VT 220
CHASSIS
R472VT
C472VT
10K
47N-K
L403
Q402
A114EK
R470
1K
R413
220(1/4)
22 21 20 19 18 17 16 15 14
REFERENCE
DIVIDER PHASE DETECTOR
1/2
PUMP
UNLOCK POWER
SWALLOW COUNTER 12bit PROGRAMABLE
ON
DETECTOR 1/16,1/17 4BIT
RESET
DATA SHIFT REGISTER
C2B I/F LATCH
1 2 3 4 5 6 7 8 9
X401
X7M2
R-NO. E3,EU E2,G2A,EK E1C,E1K,EUT N
CF401 SFE10.7MA8 SFE10.7MS3 SFE10.7MA8 -
IF
CF402
SFE10.7MA8 SFE10.7MS3 SFE10.7MS3 -
AMP
R474 180 180 - -
R407 620 680 620 -
R408 1.2K 680 1.2K -
R428 3.3K 10K 6.8K -
OUTPUT
LEVEL R473 JUMPER 2.4K JUMPER -
R444,R445 8.2K 3.3K 8.2K -
R442,R443 3.3K 2.2K 3.3K -
3 4
Q401
R456 CF401
C3880K
10M7A8
100
R410
4K7
R405 R409
100(1/4W)-R
470
L402 10UH
C404 2P
24 23 22 21
OSC
OSC REG RF
BUF
FM - IF
1 2 3 4
T403
FM-DET-B
Q404 Q403
13 12
A114EK A114EK
DIVIDER
UNIVERSAL
COUNTER
10 11 11
(TUNED PULL UP)
R478 10K
(ST PULL UP)
R477 10K
(MO/ST PULL UP)
R475
12K
R-NO. E3,EU E2,G2A,EK E1C,E1K,EUT N
T406 - INSERT - -
ANTI
BIRDIE J442 JUMPER - JUMPER -
C462 - 470P - -
T404,T405 - INSERT - -
J403,J404 JUMPER - JUMPER -
DE
R440,R441 120K 220K 120K -
EMPHASIS
R438,R439 100K 150K 100K -
-
C446,C447 270P 330P 180P -
5
TUNER B'D
T401
VR402
VR401
22K 100K
R428
R427 3K3
R426 10K
10K
20 19 18 17 16 15 14 13
NARROW
MIX AGC AM-IF S-METER DET
S-METER
LED POST IF IF
QD
DRIVER AMP BUF BUF
5 6 7 8 9 10 11 12
IC402
LA1266
R432
C463
T402 56N(M)
FM-DET-A 10K
J442
3 2
4 5
T406
E3 SB MULTI
FM:100KHz,75us FM:50KHz,50us
R472
E1,H,T,C
AM:10KHz AM:9KHz
100
SW401
R457
100
C455
22N-K
E1,H,T E1C
R457 100 100
C455 22N JUMPER
SW401 INSERT -
OPTION TABLE
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
CN401
TO CPU UNIT
R-NO. E3,EU E2,G2A,EK E1C,E1K,EUT N
-
C448,C449 470P - 330P -
R446,R447 JUMPER 470 JUMPER -
R471 18K 39K 39K -
ETC VR402 100KB 100KB 100KB -
C434 1/50 0.33/50 0.33/50 -
AVR-1804/884 / AVC-1880
6
7
C438
1/50 Q407
C440 R479
C114YK
1/50 100K
C439
0.22/50
22 21 20 19 18 17 16 15 14 13 12
VOLT OSC PHASE PILOT LAMP
REG COMPA DEF DRIVER
RATOR
VCOSTOP
TRIGGER
SYMMETRICAL
REACTANCE
CIRCUIT
FF FF FF
FF FF 38KHZ 19KHZ 19KHZ STEREO
SWITCH
DECODER
MUTING
CONTROL MUTING
FM/AM OUTPUT
CHANGE
MUTING FM
AM CHANGE
VCC ON
MUTING
1 2 3 4 5 6 7 8 9 10 11
R439 R438
100K 100K
C447
C446
270P 270P
C462
470P
C449 C448
1
470P
470P
6
T404
T405
01050 01050
J403
Q409
6CH INPUT
C3880K
E2 ONLY
R445 R444
8K2 8K2
Q406
Q405
KTC2874B KTC2874B
Q408
R448 D406
A114EK
2K2 1SS133T
CN402
1 2 3 4 5 6 7 8 9 10 11
SCHEMATIC DIAGRAMS (11/11)
TUNER UNIT
REC SIGNAL LINE
89
8
A
B
C
R903
100
SR
R904
100
SL
R911
100
SW
D
R908
100
C
R907
100
FR
R912
100
FL
C918
0.01
CHASSIS
E
89